arch/powerpc/platforms/maple/setup.c

   1 /*
   2  *  Maple (970 eval board) setup code
   3  *
   4  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
   5  *                     IBM Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version
  10  *  2 of the License, or (at your option) any later version.
  11  *
  12  */
  13
  14 #undef DEBUG
  15
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/sched.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mm.h>
  21 #include <linux/stddef.h>
  22 #include <linux/unistd.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/slab.h>
  25 #include <linux/user.h>
  26 #include <linux/a.out.h>
  27 #include <linux/tty.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/ioport.h>
  31 #include <linux/major.h>
  32 #include <linux/initrd.h>
  33 #include <linux/vt_kern.h>
  34 #include <linux/console.h>
  35 #include <linux/pci.h>
  36 #include <linux/adb.h>
  37 #include <linux/cuda.h>
  38 #include <linux/pmu.h>
  39 #include <linux/irq.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/root_dev.h>
  42 #include <linux/serial.h>
  43 #include <linux/smp.h>
  44 #include <linux/bitops.h>
  45
  46 #include <asm/processor.h>
  47 #include <asm/sections.h>
  48 #include <asm/prom.h>
  49 #include <asm/system.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/io.h>
  52 #include <asm/kexec.h>
  53 #include <asm/pci-bridge.h>
  54 #include <asm/iommu.h>
  55 #include <asm/machdep.h>
  56 #include <asm/dma.h>
  57 #include <asm/cputable.h>
  58 #include <asm/time.h>
  59 #include <asm/of_device.h>
  60 #include <asm/lmb.h>
  61 #include <asm/mpic.h>
  62 #include <asm/rtas.h>
  63 #include <asm/udbg.h>
  64 #include <asm/nvram.h>
  65
  66 #include "maple.h"
  67
  68 #ifdef DEBUG
  69 #define DBG(fmt...) udbg_printf(fmt)
  70 #else
  71 #define DBG(fmt...)
  72 #endif
  73
  74 static unsigned long maple_find_nvram_base(void)
  75 {
  76         struct device_node *rtcs;
  77         unsigned long result = 0;
  78
  79         /* find NVRAM device */
  80         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  81         if (rtcs) {
  82                 struct resource r;
  83                 if (of_address_to_resource(rtcs, 0, &r)) {
  84                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  85                                " address\n");
  86                         goto bail;
  87                 }
  88                 if (!(r.flags & IORESOURCE_IO)) {
  89                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  90                         goto bail;
  91                 }
  92                 result = r.start;
  93         } else
  94                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  95  bail:
  96         of_node_put(rtcs);
  97         return result;
  98 }
  99
 100 static void maple_restart(char *cmd)
 101 {
 102         unsigned int maple_nvram_base;
 103         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 104         struct device_node *sp;
 105
 106         maple_nvram_base = maple_find_nvram_base();
 107         if (maple_nvram_base == 0)
 108                 goto fail;
 109
 110         /* find service processor device */
 111         sp = of_find_node_by_name(NULL, "service-processor");
 112         if (!sp) {
 113                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 114                 goto fail;
 115         }
 116         maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
 117         maple_nvram_command = of_get_property(sp, "restart-value", NULL);
 118         of_node_put(sp);
 119
 120         /* send command */
 121         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 122         for (;;) ;
 123  fail:
 124         printk(KERN_EMERG "Maple: Manual Restart Required\n");
 125 }
 126
 127 static void maple_power_off(void)
 128 {
 129         unsigned int maple_nvram_base;
 130         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 131         struct device_node *sp;
 132
 133         maple_nvram_base = maple_find_nvram_base();
 134         if (maple_nvram_base == 0)
 135                 goto fail;
 136
 137         /* find service processor device */
 138         sp = of_find_node_by_name(NULL, "service-processor");
 139         if (!sp) {
 140                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 141                 goto fail;
 142         }
 143         maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
 144         maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
 145         of_node_put(sp);
 146
 147         /* send command */
 148         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 149         for (;;) ;
 150  fail:
 151         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 152 }
 153
 154 static void maple_halt(void)
 155 {
 156         maple_power_off();
 157 }
 158
 159 #ifdef CONFIG_SMP
 160 struct smp_ops_t maple_smp_ops = {
 161         .probe          = smp_mpic_probe,
 162         .message_pass   = smp_mpic_message_pass,
 163         .kick_cpu       = smp_generic_kick_cpu,
 164         .setup_cpu      = smp_mpic_setup_cpu,
 165         .give_timebase  = smp_generic_give_timebase,
 166         .take_timebase  = smp_generic_take_timebase,
 167 };
 168 #endif /* CONFIG_SMP */
 169
 170 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 171 {
 172         if (rtas_service_present("system-reboot") &&
 173             rtas_service_present("power-off")) {
 174                 ppc_md.restart = rtas_restart;
 175                 ppc_md.power_off = rtas_power_off;
 176                 ppc_md.halt = rtas_halt;
 177         }
 178 }
 179
 180 void __init maple_setup_arch(void)
 181 {
 182         /* init to some ~sane value until calibrate_delay() runs */
 183         loops_per_jiffy = 50000000;
 184
 185         /* Setup SMP callback */
 186 #ifdef CONFIG_SMP
 187         smp_ops = &maple_smp_ops;
 188 #endif
 189         /* Lookup PCI hosts */
 190         maple_pci_init();
 191
 192 #ifdef CONFIG_DUMMY_CONSOLE
 193         conswitchp = &dummy_con;
 194 #endif
 195         maple_use_rtas_reboot_and_halt_if_present();
 196
 197         printk(KERN_DEBUG "Using native/NAP idle loop\n");
 198
 199         mmio_nvram_init();
 200 }
 201
 202 /*
 203  * Early initialization.
 204  */
 205 static void __init maple_init_early(void)
 206 {
 207         DBG(" -> maple_init_early\n");
 208
 209         iommu_init_early_dart();
 210
 211         DBG(" <- maple_init_early\n");
 212 }
 213
 214 /*
 215  * This is almost identical to pSeries and CHRP. We need to make that
 216  * code generic at one point, with appropriate bits in the device-tree to
 217  * identify the presence of an HT APIC
 218  */
 219 static void __init maple_init_IRQ(void)
 220 {
 221         struct device_node *root, *np, *mpic_node = NULL;
 222         const unsigned int *opprop;
 223         unsigned long openpic_addr = 0;
 224         int naddr, n, i, opplen, has_isus = 0;
 225         struct mpic *mpic;
 226         unsigned int flags = MPIC_PRIMARY;
 227
 228         /* Locate MPIC in the device-tree. Note that there is a bug
 229          * in Maple device-tree where the type of the controller is
 230          * open-pic and not interrupt-controller
 231          */
 232
 233         for_each_node_by_type(np, "interrupt-controller")
 234                 if (of_device_is_compatible(np, "open-pic")) {
 235                         mpic_node = np;
 236                         break;
 237                 }
 238         if (mpic_node == NULL)
 239                 for_each_node_by_type(np, "open-pic") {
 240                         mpic_node = np;
 241                         break;
 242                 }
 243         if (mpic_node == NULL) {
 244                 printk(KERN_ERR
 245                        "Failed to locate the MPIC interrupt controller\n");
 246                 return;
 247         }
 248
 249         /* Find address list in /platform-open-pic */
 250         root = of_find_node_by_path("/");
 251         naddr = of_n_addr_cells(root);
 252         opprop = of_get_property(root, "platform-open-pic", &opplen);
 253         if (opprop != 0) {
 254                 openpic_addr = of_read_number(opprop, naddr);
 255                 has_isus = (opplen > naddr);
 256                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 257                        openpic_addr, has_isus);
 258         }
 259
 260         BUG_ON(openpic_addr == 0);
 261
 262         /* Check for a big endian MPIC */
 263         if (of_get_property(np, "big-endian", NULL) != NULL)
 264                 flags |= MPIC_BIG_ENDIAN;
 265
 266         /* XXX Maple specific bits */
 267         flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
 268         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 269         flags |= MPIC_BIG_ENDIAN;
 270
 271         /* Setup the openpic driver. More device-tree junks, we hard code no
 272          * ISUs for now. I'll have to revisit some stuffs with the folks doing
 273          * the firmware for those
 274          */
 275         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 276                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 277         BUG_ON(mpic == NULL);
 278
 279         /* Add ISUs */
 280         opplen /= sizeof(u32);
 281         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 282                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 283                 mpic_assign_isu(mpic, n, isuaddr);
 284         }
 285
 286         /* All ISUs are setup, complete initialization */
 287         mpic_init(mpic);
 288         ppc_md.get_irq = mpic_get_irq;
 289         of_node_put(mpic_node);
 290         of_node_put(root);
 291 }
 292
 293 static void __init maple_progress(char *s, unsigned short hex)
 294 {
 295         printk("*** %04x : %s\n", hex, s ? s : "");
 296 }
 297
 298
 299 /*
 300  * Called very early, MMU is off, device-tree isn't unflattened
 301  */
 302 static int __init maple_probe(void)
 303 {
 304         unsigned long root = of_get_flat_dt_root();
 305
 306         if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
 307             !of_flat_dt_is_compatible(root, "Momentum,Apache"))
 308                 return 0;
 309         /*
 310          * On U3, the DART (iommu) must be allocated now since it
 311          * has an impact on htab_initialize (due to the large page it
 312          * occupies having to be broken up so the DART itself is not
 313          * part of the cacheable linar mapping
 314          */
 315         alloc_dart_table();
 316
 317         hpte_init_native();
 318
 319         return 1;
 320 }
 321
 322 define_machine(maple_md) {
 323         .name                   = "Maple",
 324         .probe                  = maple_probe,
 325         .setup_arch             = maple_setup_arch,
 326         .init_early             = maple_init_early,
 327         .init_IRQ               = maple_init_IRQ,
 328         .pci_irq_fixup          = maple_pci_irq_fixup,
 329         .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
 330         .restart                = maple_restart,
 331         .power_off              = maple_power_off,
 332         .halt                   = maple_halt,
 333         .get_boot_time          = maple_get_boot_time,
 334         .set_rtc_time           = maple_set_rtc_time,
 335         .get_rtc_time           = maple_get_rtc_time,
 336         .calibrate_decr         = generic_calibrate_decr,
 337         .progress               = maple_progress,
 338         .power_save             = power4_idle,
 339 #ifdef CONFIG_KEXEC
 340         .machine_kexec          = default_machine_kexec,
 341         .machine_kexec_prepare  = default_machine_kexec_prepare,
 342         .machine_crash_shutdown = default_machine_crash_shutdown,
 343 #endif
 344 };